pycel.excelformula.UnknownFunction: Traceback (most recent call last):
File "D:\workspace\python\pycel\src\pycel\excelformula.py", line 952, in eval_func
ret_val = in_array_formula_context.fit_to_range(excel_formula.compiled_lambda())
File "D:\workspace\python\pycel\src\pycel\excelformula.py", line 968, in <lambda>
### Traceback will show this line if not loaded from a text file
NameError: name 'isblank' is not defined